Access to siginfo for the signal from debugger

[Kostik Belousov]

On Thu, Jul 01, 2010 at 05:05:26PM -0400, John Baldwin wrote:
> On Thursday 01 July 2010 09:42:17 am Kostik Belousov wrote:
> > Hi,
> > below is the patch that provides the debugger with access to siginfo
> > of the signal that stopped the debuggee. This allows to see a lot more
> > details for the cause of the process stop. E.g. you can see a fault
> > address if process get SIGSEGV or SIGBUS, you can distinguish between
> > breakpoint-generated SIGTRAP and non-breakpoint, whether the signal
> > was send due to external event etc.
> > 
> > The change to struct ptrace_lwpinfo is backward-compatible in the sense
> > that programs that were compiled with old definition for the struct will
> > work on new kernels.
> 
> Nice!  Does gdb "just work" with these changes or does it need patching as 
> well?
It should "just work", and my testing seems to confirm this. gdb uses
PT_LWPINFO to enumerate the thread ids, and I checked it on mt process.

As I said, the change is ABI backward-compatible, i.e. you do not need
even to recompile the old program for new kernel.

Sure, gdb cannot show additional available information without
modifications.
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